JP2011127677A - Elbow coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elbow coupling constructed by bending a metallic round pipe, stably applying a tool near a lock nut and in a sufficient area range. <P>SOLUTION: In this elbow coupling, a first screw part in which the lock nut 31 is screwed is provided at the tip end of one side part 26 in a body part 25 including both side parts 26, 27 orthogonal to each other, a second screw part 29 screwed in a fixed part is provided further on the tip end side of the first screw part, and a third screw part 30 to which a pipe is connected is provided at the tip end side of the other side part 27. A pair of plane parts 35, 35 to which the tool is applied are symmetrically disposed on the outer periphery of the center area between the inside and the outside of a curve in the body part 25, and provided continuously extending over the whole length of the body part 25. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an elbow joint for piping used for hydraulic piping of a hydraulic excavator.

  The background art will be described by taking an elbow joint used as an example when connecting an upper pipe to a swivel joint of a hydraulic excavator.

  As shown in FIG. 7, a swivel joint 1 is provided across the lower traveling body and the upper swing body, and this swivel joint 1 and a control valve (not shown) provided on the upper swing body are connected to a hydraulic pipe (hose) 2. , 3.

  Conventionally, a square elbow joint 4 is generally used at a connecting portion between the swivel joint 1 and the hydraulic pipes 2 and 3.

  As shown in FIGS. 8 and 9, the square elbow joint 4 is formed on one side of the substantially rectangular parallelepiped body portion 5 (hereinafter referred to as the lower side according to the direction of the drawing, and the side perpendicular thereto is called the lateral side). , A first screw portion 7 into which the lock nut 6 is screwed, a second screw portion 8 to be screwed into the swivel joint 1 on the further tip side of the first screw portion 7, and hydraulic pipes 2, 3 on the lateral side. Is provided and provided with a third screw portion 9 (see Patent Document 1).

  In FIG. 9, 10 is a washer provided between the lock nut 6 and the upper surface of the swivel joint, and 11 is a seal member interposed below the washer 10.

  This square elbow joint 4 is manufactured by drilling and screwing an elbow material made by cutting out a thick metal plate into an L shape, and a tool (spanner) is applied to both side flat portions 5a and 5a of the main body portion 5. Since it can be applied, workability of piping work such as tightening of the lock nut 6 is good.

  However, the square elbow joint 4 has a problem that the number of processing steps is increased and the cost is increased, and the internal flow path 12 is bent at a right angle as shown in FIG.

  Therefore, as an elbow joint with low cost and low pressure loss, an elbow material is made by bending a thick metal round pipe into an L-shape as shown in Fig. 10, and this is subjected to necessary processing such as threading. A constructed pipe elbow joint 13 has been proposed (see Patent Document 2).

  This pipe elbow joint 13 includes first and second screw portions (only the second screw portion 17 is shown) on one side portion 15 of the orthogonal side portions 15 and 16 constituting the main body portion 14 and the other side. Each of the side parts 16 is provided with a third screw part 18.

  In FIG. 10, 19 is a lock nut, 20 is a washer, 21 is a seal member, and 22 is an L-shaped flow path.

Japanese Utility Model Publication No. 62-176580 JP 2002-273522 A

  However, as a basic problem of the pipe elbow joint 13, unlike the square elbow joint 4, there is no flat portion on which the tool is applied to the main body portion 14, so that the lock nut 6 is tightened or the orientation of the joint 13 is adjusted. The workability of piping connection work to be performed becomes worse.

  In Patent Document 2, as shown by a two-dot chain line in FIG. 10, a pair of plane portions (only one side is shown in the figure) 23 can be formed by pressing the bent central portion of the main body portion 14 from both sides. .

However, as a limit of press working,
(i) Since the flat surface portion 23 can be formed only at the center portion that is far from the lock nut 6 as shown in the figure, the distance between the tool for operating the nut and the tool for fixing the main body portion is widened when tightening the lock nut. Difficult to do,
(ii) The workability is not improved by the fact that the flat surface portion 23 is limited to a very narrow area range that is insufficient for applying a tool.

  Therefore, the present invention provides an elbow joint that can be applied to a tool in the vicinity of a lock nut and stably in a sufficient area range while being made of a pipe.

  According to the first aspect of the present invention, a metal pipe is bent into an L-shape, and a first screw portion into which a lock nut is screwed into a distal end side of one side portion of a main body portion composed of orthogonal side portions, the first screw In the elbow joint formed by providing the second screw part to be screwed into the fixed part on the further tip side of the part and providing the third screw part to which the pipe is connected on the tip side of the other side part, At least a pair of plane portions on which the tool is applied by cutting work are provided in a symmetrical arrangement on the outer periphery of one side portion of the main body portion.

  According to a second aspect of the present invention, in the configuration of the first aspect, the planar portion is provided on the one side portion and the other side portion.

  According to a third aspect of the present invention, in the configuration of the second aspect, the planar portion is provided continuously across the one side portion and the other side portion.

According to the present invention, in a pipe elbow joint, at least a pair of tools can be applied to the outer periphery of one side part (side part provided with a first screw part into which a lock nut is screwed) by cutting. Because the plane part of
(I) The flat part is located near the lock nut, and both the tool for the main body part and the lock nut can be brought close to each other, so that the operability is good.
(II) The workability of the pipe connection work can be improved by securing a necessary and sufficient area for placing the tool on the flat surface with good stability.

  In this case, the plane part may be provided only on the one side part, or may be provided on the one side part and the other side part as in the invention of claim 2. Alternatively, it may be provided continuously across the one side portion and the other side portion (up to the entire length of the main body portion) as in the invention of claim 3.

  According to the second and third aspects of the invention, the choice of the position where the tool is applied widens, so it is optimal according to the operator's preference, the presence or absence of an obstacle, and the work situation such as when piping is connected to the third screw part. It is possible to increase the efficiency of the work by putting the tool at the correct position.

It is a perspective view of the connection part of the swivel joint and upper piping of the hydraulic shovel in which the elbow joint concerning a 1st embodiment of the present invention was used. (a) and (b) are the expansion perspective views which looked at the elbow joint concerning a 1st embodiment from two different directions. It is the same side view. It is the longitudinal cross-sectional view. (a) (b) (c) is a side view which shows the elbow joint which concerns on 2nd, 3rd, 4th embodiment of this invention. It is a side view of the elbow joint which concerns on 5th Embodiment of this invention. It is a perspective view of the connection part of the swivel joint and upper piping of the hydraulic shovel in which the conventional square elbow joint was used. It is an expansion perspective view of the joint. FIG. It is a perspective view of the conventional pipe elbow joint.

  An embodiment of the present invention will be described with reference to FIGS.

1st Embodiment (refer FIGS. 1-4)
In the embodiment, as shown in FIG. 1, standard elbow joints 24... Used when connecting the upper pipes (hoses) 2 and 3 shown in FIG. Yes.

  As with the conventional pipe elbow joint 13 shown in FIG. 10, this elbow joint 24 is made by bending a thick metal round pipe material into an L-shape to make an elbow material, which is then subjected to necessary processing such as threading. It is made up of. The basic configuration is also the same as that of the conventional pipe elbow joint 13.

  That is, as shown in FIGS. 2 to 4, the joint 24 includes first and second screws on one side part 26 on the swivel joint side among the orthogonal side parts 26 and 27 constituting the main body part 25. The third screw portions 30 are provided on the portions 28 and 29 and the other side portion 27, respectively.

  A lock nut 31 is screwed into the first screw portion 28, a washer 32 and a seal member 33 are fitted below the nut 31, and a second screw portion 29 is screwed into the swivel joint 1 in FIG. And it is fastened and fixed by the lock nut 31.

  In FIGS. 2 and 4, reference numeral 34 denotes an L-shaped channel formed across both side portions 26 and 27.

  The elbow joint 24 is provided with a pair of flat surface portions 35 and 35 on the outer periphery of the main body portion 25 where a tool can be applied by cutting.

More specifically, the both side plane portions 35, 35 are
(i) On the inner and outer central portions of the bend in the main body portion 25,
(ii) symmetrical arrangement (180 ° interval) across the flow path 34;
(iii) From the tip of the one side part 26 to the tip of the other side part 27, that is, in an L shape continuous over the entire length of the main body part 25,
(iv) It is formed with a width dimension W (same on both sides, for example, 10 mm to 12 mm) necessary and sufficient for applying the tool (spanner) stably.

  In addition, the cutting process of the plane parts 35 and 35 may be performed in the previous stage (including immediately after bending of the metal pipe) of the threaded parts 28 to 30 with respect to the elbow material or in the final stage. Also good.

According to this configuration
(I) Since the plane portions 35 and 35 are located near the lock nut 31 and both the tool for the main body portion and the lock nut can be brought close to each other, the operability is good.
(II) Since the flat portions 35 and 35 are formed by cutting, it is possible to improve the workability of the pipe connection work by securing a necessary and sufficient area for placing the tools on the flat portions 35 and 35 stably. it can.

  In this case, in the first embodiment, since the flat portions 35 are continuously provided over the entire length of the main body portion 25, the preference of the operator, the case where there is an obstacle near the lock nut 31, etc. It is possible to apply the tool by selecting the optimum position according to the work situation.

  Further, when connecting the pipe to the third threaded portion 30, a tool for fixing the joint 24 can be applied at a portion close to the threaded portion 30.

  In these respects, work efficiency can be further improved.

Other embodiments (see FIGS. 5 and 6)
Only differences from the first embodiment will be described. In both figures, only one side of the flat portion 35 is shown.

  As a second embodiment, as shown in FIG. 5 (a), the side flat surface portions 35 may be formed at positions slightly shifted outward rather than at the center portion of the bend.

  In this way, workability in the case of performing a tightening operation of the lock nut 31 by applying a tool from the outside of the bend is improved.

  Alternatively, although not shown, it may be formed at a position slightly shifted to the opposite side (inside) so that the tool can be easily applied from the inside of the bend.

  As a third embodiment, as shown in FIG. 5 (b), the flat portion 35 may be provided only on one side portion 26 and only on a portion close to the lock nut 31.

  This will make cutting easier.

  In the fourth embodiment shown in FIG. 5C, as an intermediate form between the first embodiment and the third embodiment, the flat surface portion 35 is provided in the range from the one side portion 26 to the central portion of the bend.

  5C illustrates the case where the width dimension is narrower than the others at the center portion of the bend, it goes without saying that the same width may be used for the entire length of the plane portion.

  In addition, although not shown, the both side plane portions 35 may be provided separately on the one side portion 26 and the other side portion 27.

  On the other hand, the present invention can also be applied to a so-called long elbow joint 24 ′ in which the one side part 26 is longer than the other side part 27 as shown in FIG. 6 as the fifth embodiment.

  In this case, in the illustrated example, in order to minimize the cutting range, the flat portion 35 is provided only in a range extending from the upper portion of the one side portion 26 (portion close to the bent portion) to the other side portion 27. However, it may be provided over the entire length of the main body portion 25 as in the first embodiment. Moreover, you may employ | adopt the plane part arrangement | positioning of 2nd-4th each embodiment shown to Fig.5 (a)-(c).

24, 24 'Elbow joint 25 Body part of the joint 26 Same side part 27 Same side part 28 Same 1st screw part 29 Same 2nd screw part 30 Same 3rd screw part 31 Lock nut 32 Washer 33 Seal member 34 Flow path 35, 35 Plane portion

Claims (3)

  A metal pipe is bent into an L shape, and a first threaded portion into which a lock nut is screwed into a distal end side of one side portion of a main body portion composed of orthogonal side portions, on a further distal end side of the first threaded portion, In the elbow joint formed by providing the second screw part to be screwed into the fixed part and providing the third screw part to which the pipe is connected at the tip side of the other side part, one side part of the main body part An elbow joint characterized in that at least a pair of plane portions to which a tool is applied by cutting work are provided in a symmetrical arrangement on the outer periphery of the elbow.   The elbow joint according to claim 1, wherein the flat portion is provided on the one side portion and the other side portion.   The elbow joint according to claim 2, wherein the flat surface portion is provided continuously across the one side portion and the other side portion.

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